[PATCH 3/9] btrfs: replace back to suspend state if EXCL OP is running

[Anand Jain <anand.jain@oracle.com>]

In a secnario where balance and replace co-exists as below,
  start balance; pause balance; start replace; reboot
and when system restarts balance restarts first and the
replace restart will fail as EXCL OP lock is already held by
the balance. If so place the replace state back to
BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED state.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
---
 fs/btrfs/dev-replace.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c
index 47d6768a9cde..e001c2418940 100644
--- a/fs/btrfs/dev-replace.c
+++ b/fs/btrfs/dev-replace.c
@@ -898,6 +898,11 @@ int btrfs_resume_dev_replace_async(struct btrfs_fs_info *fs_info)
 	 * dev-replace to start anyway.
 	 */
 	if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) {
+		btrfs_dev_replace_write_lock(dev_replace);
+		dev_replace->replace_state =
+					BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED;
+		dev_replace->item_needs_writeback = 1;
+		btrfs_dev_replace_write_unlock(dev_replace);
 		btrfs_info(fs_info,
 		"cannot resume dev-replace, other exclusive operation running");
 		return 0;
-- 
1.8.3.1